# EngineCalc vs Fast Converter Pro

The clearest difference is review sentiment: EngineCalc at 67% against Fast Converter Pro's 0%. Fast Converter Pro's advantage is price (Free vs $0.99) and update cadence (monthly vs every 22 months). On ads and in-app purchases there is nothing between them.

Fast Converter Pro is free to download; EngineCalc costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

EngineCalc ships an update every 22 months, Fast Converter Pro monthly. The most recent releases landed on October 11, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | EngineCalc | Fast Converter Pro |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[3.0 (4 ratings)](https://appshunter.io/ios/app/enginecalc/id378824382/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Monthly** |
| Monetization | Paid | **Free** |
| Size | 13 MB | 22 MB |
| Requires iOS | 26.0 | **10.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [iTrinity, Inc.](https://appshunter.io/developer/547108075) | [JUPITER TEKNOLOJI SANAYI VE TICARET LIMITED SIRKETI](https://appshunter.io/developer/1400061771) |

## What reviewers say

### EngineCalc

[App page](https://appshunter.io/ios/app/enginecalc/id378824382)

This utility app provides a collection of essential formulas and calculators for powersports and engine tuning. It allows users to perform complex calculations directly on their iPhone, eliminating the need for a laptop or desktop computer.

**Highlights:** Powersports formulas, Engine tuning calculators, Actual Volume Flow, Air Density, Compression Ratio, Cylinder Displacement, Volumetric Efficiency

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Fast Converter Pro

[App page](https://appshunter.io/ios/app/fast-converter-pro-units/id1358772909)

This utility app offers a smart and elegant tool for converting between various units of measurement. It covers over 9 common categories, including length, temperature, mass, and volume, with a simple and optimized user interface.

**Highlights:** 9+ unit categories, Length conversion, Temperature conversion, Mass conversion, Volume conversion, Simple UI

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is EngineCalc free?

EngineCalc costs $0.99, with no in-app purchases.

### Is Fast Converter Pro free?

Fast Converter Pro is free to download, with no in-app purchases.

### Do EngineCalc or Fast Converter Pro have ads?

Neither EngineCalc nor Fast Converter Pro shows ads.

### Which is updated more often, EngineCalc or Fast Converter Pro?

EngineCalc ships an update every 22 months, and Fast Converter Pro monthly. Most recently, EngineCalc was updated on October 11, 2026 and Fast Converter Pro on October 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*